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claudia-bouman
Team TFS
Team TFS
High-precision U–Pb dating of complex zircon from the Lewisian Gneiss Complex of Scotland using an incremental CA-ID-TIMS approach
Q.G. Crowley (1), R. Key (2), S.R. Noble (3)
1) School of Natural Sciences, Department of Geology, Trinity College, Dublin 2, Ireland, 2) British Geological Survey, Murchison House,West Mains Road, Edinburgh EH9 3LA, UK, 3) NERC Isotope Geosciences Laboratory, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
Gondwana Research (2015), V27, pp1381–1391, doi: 10.1016/j.gr.2014.04.001
A novel approach of thermally annealing and sequentially partially dissolving single zircon grains prior to high-precision Isotope Dilution Thermal Ionization Mass Spectrometry (ID-TIMS) is presented. This technique is applied to complex zircon from the Precambrian Lewisian Gneiss Complex of Scotland. Up to six partial dissolutions were conducted at incrementally higher temperatures and analysed at each successive step. Using this technique of pseudo-spatial resolution coupled with high-precision analysis it is possible to recognise discrete Pb-loss and multiple stages of zircon growth or isotopic resetting within single grains to within 0.1–0.2% error (2σ) on individual 207Pb/206Pb ages. This method has relevance to U–Pb zircon geochronology where conventional micro-beam techniques are unable to resolve between separate ages within single grains.
  • TIMS
  • Triton
  • U-Pb
  • Zircons
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